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More than meets the eye

The Onkyo M-5000R power amp: all that power and good looks too

If you've been looking at other power amps here you've probably noticed that our descriptions are pretty spare most of the time. That's because not much moves or needs controlling on a power amp. But I'm going to break with tradition a bit for the Onkyo M-5000R. It's got so many good things going for it that they deserve to be called out. Bear with me.

First of all, and probably least important to the performance, it's got a lovely set of power meters on the front panel that add to the unit's overall attractiveness, and foreshadows the fine build quality you'll discover as we dig a little deeper.

Power enough for nuance and thunder

An amplifier's power rating can only tell you so much. What's even more important is how well it controls the power it purports to deliver. The M-5000R doesn't disappoint. Two massive toroidal transformers feed four 27,000 microfarad storage capacitors to create a reservoir of clean, instantly available power for your demanding stereo sources. Sudden violin bowing attacks, slamming kick drums, fat synth bass lines, a stabbing horn riff — all are faithfully re-created with all their intended impact.

Kick it up a notch

Need even more pristine power? Consider getting two M-5000Rs and running them each in mono mode. With a pro-grade XLR feed from your preamp to the Bridge-Tied Load (BTL) input on each amp, you'll be sending 180 extra-clean watts on both channels. That extra dynamic range will let your music's passion and energy shine through every time.

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This amp is the real deal

Written By Hank N, Nashville on Thursday, October 03, 2013

I finally bit the bullet and bought one of these amps to replace my Yamaha a-s500 (which is great). I just couldn't stop drooling over how it looks with those meters on the front! Also, the curiosity of how something top of the line that weighs 52 pounds would sound compared to my 400 dollar yamaha.

To be brief, it sounds great. I'm using my onkyo 9050's preouts fyi. I can't afford the p 3000 preamp that was made to go with this.... yet. The difference in sound is noticeable but not mind blowing. Everything is tighter and clearer. Cleaner. Especially lower end sound which has a tendency to sound loose on the yamaha by comparison. Even at mild volumes the sound is noticeably clearer. I hooked several speakers to this amp and my opinion of these speakers changed after listening through this setup (jbl studio 530s, Definitive studio monitor 55s, and Martin Logan Motion 12s). Overall the change in the sound of the 530's was most impressive. The imaging on these things is killer. Detailed too. But this is off topic....

The fit and finish of this amp is....amazing. It looks better than the pictures. The heavy duty speaker posts on the back are really nice too. I can't say its has 4 times better sound of the yamaha compared to the price, but it looks 10 times better! And, like most of high end gear, there is that diminishing returns thing you must think about. Oh yeah, I don't know what the other guy is talking about with the one star review....

Disappointing

Written By AnthonyN, Washington DC on Tuesday, December 25, 2012

I was so disappointed by this amp. My Onkyo M-282 appears much better than the M-5000R. The M-5000R seemed not to have enough power. 80 watts is the maximum before the sounds weakens in my opinion. The Onkyo M-282 is an incredible value and sound performance, warm, dynamic, musical, bass punchy and crisp. I was mislead by the reviews and weight of M-5000R.

DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry):
Since the advent of digital audio, signal-to-noise ratios have
improved dramatically. However, the S/N ratio reflects static noise only,
and takes no account of another type of noise that occurs as the byproduct
of sound reproduction; dynamic noise. To reduce this type of noise, Onkyo
has developed DIDRC technology. Despite being beyond the normal range of
human hearing, frequencies above 100 kHz are susceptible to clock pulse and
other forms of distortion from digital devices. Such distortion in the
super-high-frequency range can generate "beat interference", which in turn
affects the character of the original sound. By improving linearity and
reducing distortion in the super-high frequency range, Onkyo's new DIDRC
technology effectively reduces perceptible noise and delivers clearer, truer
audio.

Low NFB (Negative-Feedback Design): Too much NFB makes
a system susceptible to counter-electromotive force from the speakers,
resulting in a drop in perceived sound quality. To avoid this, Onkyo focuses
on improving the frequency response and reducing distortion, without relying
so much on NFB.

Closed Ground-Loop Circuits: AWRAT amplifiers employ a
sophisticated closed-circuit design in which each circuit has a separate
link to the power supply. This helps to cancel individual circuit noise and
keep the ground potential free of distortion.

HICC (High Instantaneous-Current Capability): HICC
enables an AWRAT amplifier to immediately cancel the speakers' reflex energy
and instantaneously send out the next signal. The same high current required
to achieve this also supports the amplifier's ability to handle speaker
impedance fluctuations.

Symmetrical Twin-Monaural Construction: Power devices
for the left and right channels of an AWRAT amplifier is aligned
symmetrically. Each channel has the same electrical and structural design,
and signal pathways are uniform in length. This helps to minimize errors in
stereophonic playback.

New Circuit Board Construction w/ Internal Struts to Reduce
Vibration: Rather than being directly connected to the chassis base,
the circuit boards inside the M-5000R are cushioned by internal struts and
affixed to the front, side, and rear panels. This method of construction
prevents vibrations from the chassis from adversely affecting the circuit boards

Two Massive Toroidal Transformers w/ Sub Transformer: The
M-5000R incorporates two massive toroidal transformers that reduce magnetic flux
leakage, improve efficiency, and keep the power supply stable. Also on-board are
a sub-transformer and four 27,000 microfarad capacitors that work to make the
current significantly smoother.

Power Meter: The front-panel power meters show the output power level
of each of the amplifier's two channels. The large power meters have been
designed so that the indicator needles move up to the peak level quickly and
then return more slowly. This make it easier to read transient power levels
which last for only a fraction of a second.

Balanced XLR Input for Monural Amplification (in BTL mode): The
M-5000R offers the audiophile possibilities of BTL (Bridge-Tied Load) through its pro-grade XLR
input. You can use the BTL feature in conjunction with a compatible pre-amp and
a second M-5000R power amp to double the power output for left and right channels.

Stereo RCA Inputs: The Onkyo M-5000R is fitted with a set of
gold-plated, machined brass stereo RCA inputs to connect to an external
preamplifier (such as the
Onkyo P-3000R, sold separately). You cannot connect the amp's stereo RCA inputs and balanced XLR
input as the same time (this may damage the amplifier).

Binding Post Speaker Terminals: The Onkyo M-5000R power amplifier
features four gold-plated binding-post speaker terminals to connect a pair of
loudspeakers. The binding-post speaker terminals will accept bar wire (up to
10AWG), pin-connectors, spade-lugs, and banana plugs (single only). The power
amplifier supports speakers from 4-ohm to 16-ohm.

12V Trigger Input/Output: The 12V trigger input/output jacks (3.5mm)
enable the amplifier to turn-on and go into standby mode based on the standby
status of the connected component, also featuring a 12V trigger jack.

Auto Standby: The power amplifier will automatically enter Standby
mode if the amp receives not signal for approximately 3 hours.

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